init nix-os configuraion files

modules/home/theme.nix

@@ -0,0 +1,47 @@
+{ pkgs, ... }:
+
+{
+  imports = [
+  ];
+
+  home = {
+    pointerCursor = {
+      package = pkgs.capitaine-cursors;
+      name = "capitaine-cursors";
+      size = 16;
+      gtk.enable = true;
+      x11.enable = true;
+      x11.defaultCursor = "capitaine-cursors";
+    };
+  };
+
+  # gtk's theme settings, generate files: 
+  #   1. ~/.gtkrc-2.0
+  #   2. ~/.config/gtk-3.0/settings.ini
+  #   3. ~/.config/gtk-4.0/settings.ini
+  gtk = {
+    enable = true;
+    # cursorTheme = {
+    #   package = pkgs.capitaine-cursors;
+    #   name = "capitaine-cursors";
+    #   size = 16;
+    # };
+
+    iconTheme = {
+      package = pkgs.papirus-icon-theme;
+      name = "Papirus-Dark";
+    };
+    gtk3.extraConfig = {
+      gtk-application-prefer-dark-theme = "0";
+      gtk-theme-name = "Adwaita-dark";
+      gtk-icon-theme-name = "Papirus-Dark";
+      gtk-cursor-theme-name = "capitaine-cursors";
+    };
+    gtk4.extraConfig = {
+      gtk-application-prefer-dark-theme = "0";
+      gtk-theme-name = "Adwaita-dark";
+      gtk-icon-theme-name = "Papirus-Dark";
+      gtk-cursor-theme-name = "capitaine-cursors";
+    };
+  };
+}